Flue joint



Feb. 7, 1928.

R. B. HOUSLEY FLUE JOINT Filed Dec. 6. 1926 gmmdov RoberzBHousley Patented ldelo. 7, 1?

UNITED STATES FATENTF "FFllil.

ROBERT B. HOUSLEY, F ZNDIANAPULIS, INDZANA, ASSIGNOR OF ONE-HALF T0 EVELYN" G. EOUSLEY.

FLUE

JOINT.

My said invention relates to a pipe and plate joint or connection and particularly to av connection between a boiler flue and a fine plate or sheet. It is an object of the invention to provide a connection which will not leak due to deterioration on account of expansion and contraction caused by intense heat to which the same is subjected, all as will be hereinafter more particularly described and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a partial elevation and sectional view illustrating the method of assembling parts illustrating the application of my invention, and

Figure 2, a similar view showing the parts completely assembled.

In the drawings reference character indicates a plate comprising the flue sheet of a boiler having a plurality of circular openings 11 therethrough. only one being shown, around each of which openings on the outer side of the sheet is cut an annular groove 12 which extends partially through the sheet and leaves a relatively thin short annular rib 13 having its end portion 14: inclined or beveledas shown. The rib 13 is disposed between the circular opening 11 and the groove 12. A boiler tube 15 is trained at its outer end with a flared mouth about which is disposed a thickened annular rearwardly extending peripheral. collar 1.6 having its outer surface disposed in substantially parallel relation to the tube fitting snugly in the opening 11 and screw threaded for co-operation with the threads on the interior of the groove 12.

A. packing or gasket 18 of soft metal is preferably disposed in the bottom of the groove 12 between the annular rib l3 and the wall of the groove against which packing the end of the collar 16 engages and thereby forms a steam and water tight joint. Due to the fact that the end of the flue is beveled or flared it acts as a brace when the expansion of the flue sheet takes place and when the flue and flue sheet cool off the end of the flue will naturally stay in place and the inner edge held by the flange which braces against the gasket prevents the flue joint from leaking thereby making a useful and safe flue connection. A flue connected to this flue sheet as above described is substantially leak proof under severe heat under which it is subject and there is practically no danger of the flue sheet breaking away from the flue due to the expansion and contraction of the metal in the parts when the same is subjected to successive heat. The increased amount of metal present around the end of the flue assists in preventing it from cracking off or breaking at this point and the construction is relatively simple and effective and forms a joint which is not liable to leak.

It will be obvious to those skilled in the art that various changes. may be made in my device without departing from the spirit of my invention, and I, therefore, do not limit myself to what is shown in the drawings and described in the specification, but only as set forth in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is: i

1. The combination of a flue sheet having a perforation theret-hrough with an annular groove around the same the outer wall of which is threaded, an annular rib formed around the opening in the flue sheet between the perforation and the groove said annular rib having an inclined end, a flue having a flared end fitting snugly within the perforation in the flue sheethaving external threads for cooperation with the threads in the annular groove and having a rearward ly extending annular portion with an underlying inclining surface for cooperation with the inclined end of the annular rib whereby the parts will cooperate to form a tight joint, substantially as set forth.

2. The combination of a fine sheethaving a perforation therethrough with an annular groove around the samethe outer wall of which is threaded, an annular rib formed around the opening in the flue sheet between the perforation and the groove said annular rib having an inclined end, a fine having a flared end fitting snugly within the perforation in the line sheet having external threads for cooperation with the threads in the annular groove and having a rearwardly extending annular portion with an underlying lIlOllIllIlg surface for cooperation with the lncllned end of the annular rib whereby the parts will cooperate to form a tightjoint,

the inclination of the end of the annular rib being greater than the inclination of the cooperating surface of the tube whereby the ROBERT B. HO TEH'JICY. 

